static error_t vfl_vsvfl_write_single_page(vfl_device_t *_vfl, uint32_t dwVpn, uint8_t* buffer, uint8_t* spare, int _scrub)
{
vfl_vsvfl_device_t *vfl = CONTAINER_OF(vfl_vsvfl_device_t, vfl, _vfl);
uint32_t pCE = 0, pPage = 0;
int ret;
ret = virtual_page_number_to_physical(vfl, dwVpn, &pCE, &pPage);
if(FAILED(ret)) {
bufferPrintf("vfl_vsvfl_write_single_page: virtual_page_number_to_physical returned an error (dwVpn %d)!\r\n", dwVpn);
return ret;
}
ret = nand_device_write_single_page(vfl->device, pCE, 0, pPage, buffer, spare);
if(FAILED(ret)) {
if(!vfl_check_checksum(vfl, pCE))
system_panic("vfl_vsfl_write_single_page: failed checksum\r\n");
vfl->contexts[pCE].write_failure_count++;
vfl_gen_checksum(vfl, pCE);
// TODO: add block map support
// vsvfl_mark_page_as_bad(pCE, pPage, ret);
if(_scrub)
add_block_to_scrub_list(vfl, pCE, pPage / vfl->geometry.pages_per_block); // Something like that, I think
return ret;
}
return SUCCESS;
}
static error_t vsvfl_write_vfl_cxt_to_flash(vfl_vsvfl_device_t *_vfl, uint32_t _ce) {
if(_ce >= _vfl->geometry.num_ce)
return EINVAL;
if(!vfl_check_checksum(_vfl, _ce))
system_panic("vsvfl_write_vfl_cxt_to_flash: failed checksum\r\n");
uint8_t* pageBuffer = memalign(0x40, _vfl->geometry.bytes_per_page);
uint8_t* spareBuffer = memalign(0x40, _vfl->geometry.bytes_per_spare);
if(pageBuffer == NULL || spareBuffer == NULL) {
bufferPrintf("vfl: cannot allocate page and spare buffer\r\n");
return ENOMEM;
}
memset(pageBuffer, 0x0, _vfl->geometry.bytes_per_page);
vfl_vsvfl_context_t *curVFLCxt = &_vfl->contexts[_ce];
curVFLCxt->usn_inc = _vfl->current_version++;
uint32_t curPage = curVFLCxt->usn_page;
curVFLCxt->usn_page += 8;
curVFLCxt->usn_dec -= 1;
vfl_gen_checksum(_vfl, _ce);
memcpy(pageBuffer, curVFLCxt, 0x800);
int i;
for (i = 0; i < 8; i++) {
memset(spareBuffer, 0xFF, _vfl->geometry.bytes_per_spare);
((uint32_t*)spareBuffer)[0] = curVFLCxt->usn_dec;
spareBuffer[8] = 0;
spareBuffer[9] = 0x80;
uint32_t bankStart = (curVFLCxt->vfl_context_block[curVFLCxt->usn_block] / _vfl->geometry.blocks_per_bank) * _vfl->geometry.bank_address_space;
uint32_t blockOffset = curVFLCxt->vfl_context_block[curVFLCxt->usn_block] % _vfl->geometry.blocks_per_bank;
int status = nand_device_write_single_page(_vfl->device, _ce, 0, (bankStart + blockOffset) * _vfl->geometry.pages_per_block_2 + curPage + i, pageBuffer, spareBuffer);
if(FAILED(status)) {
bufferPrintf("vfl_write_vfl_cxt_to_flash: Failed write\r\n");
free(pageBuffer);
free(spareBuffer);
// vsvfl_mark_page_as_bad(_ce, (bankStart + blockOffset) * _vfl->geometry.pages_per_block_2 + curPage + i, status);
return EIO;
}
}
int fails = 0;
for (i = 0; i < 8; i++) {
uint32_t bankStart = (curVFLCxt->vfl_context_block[curVFLCxt->usn_block] / _vfl->geometry.blocks_per_bank) * _vfl->geometry.bank_address_space;
uint32_t blockOffset = curVFLCxt->vfl_context_block[curVFLCxt->usn_block] % _vfl->geometry.blocks_per_bank;
if(FAILED(nand_device_read_single_page(_vfl->device, _ce, 0, (bankStart + blockOffset) * _vfl->geometry.pages_per_block_2 + curPage + i, pageBuffer, spareBuffer, 0))) {
//vsvfl_store_block_map_single_page(_ce, (bankStart + blockOffset) * _vfl->geometry.pages_per_block_2 + curPage + i);
fails++;
continue;
}
if(memcmp(pageBuffer, curVFLCxt, 0x6E0) || ((uint32_t*)spareBuffer)[0] != curVFLCxt->usn_dec || spareBuffer[8] || spareBuffer[9] != 0x80)
fails++;
}
free(pageBuffer);
free(spareBuffer);
if(fails > 3)
return EIO;
else
return SUCCESS;
}
int VFL_Write(u32 virtualPageNumber, u8* buffer, u8* spare)
{
u16 virtualBank;
u16 virtualBlock;
u16 virtualPage;
u16 physicalBlock;
u32 dwVpn;
int page;
int ret;
dwVpn = virtualPageNumber + (NANDGeometry->pagesPerSuBlk * FTLData->field_4);
if(dwVpn >= NANDGeometry->pagesTotal) {
LOG("ftl: dwVpn overflow: %d\n", dwVpn);
return -EINVAL;
}
if(dwVpn < NANDGeometry->pagesPerSuBlk) {
LOG("ftl: dwVpn underflow: %d\n", dwVpn);
}
virtual_page_number_to_virtual_address(dwVpn, &virtualBank, &virtualBlock, &virtualPage);
physicalBlock = virtual_block_to_physical_block(virtualBank, virtualBlock);
page = physicalBlock * NANDGeometry->pagesPerBlock + virtualPage;
#ifdef IPHONE_DEBUG
LOG("ftl: vfl_write: vpn: %u, bank %d, page %u\n", virtualPageNumber, virtualBank, page);
#endif
ret = nand_read(virtualBank, page, PageBuffer, SpareBuffer, true, true);
if(ret != ERROR_EMPTYBLOCK)
{
LOG("ftl: WTF trying to write to a non-blank page! vpn = %u bank = %d page = %u\r\n", virtualPageNumber, virtualBank, page);
return -1;
}
ret = nand_write(virtualBank, page, buffer, spare, true);
if(ret == 0)
return 0;
++pstVFLCxt[virtualBank].field_16;
vfl_gen_checksum(virtualBank);
vfl_schedule_block_for_remap(virtualBank, virtualBlock);
return -1;
}
static int add_block_to_scrub_list(vfl_vsvfl_device_t *_vfl, uint32_t _ce, uint32_t _block) {
if(is_block_in_scrub_list(_vfl, _ce, _block))
return 0;
if(_vfl->contexts[_ce].scrub_list_length > 0x13) {
bufferPrintf("vfl: too many scrubs!\r\n");
return 0;
}
if(!vfl_check_checksum(_vfl, _ce))
system_panic("vfl_add_block_to_scrub_list: failed checksum\r\n");
_vfl->contexts[_ce].scrub_list[_vfl->contexts[_ce].scrub_list_length++] = _block;
vfl_gen_checksum(_vfl, _ce);
return vsvfl_store_vfl_cxt(_vfl, _ce);
}
static int vfl_store_cxt(int bank)
{
int i;
int good;
SpareData* spareData = (SpareData*) SpareBuffer;
--pstVFLCxt[bank].usnDec;
pstVFLCxt[bank].usnInc = ++curVFLusnInc;
pstVFLCxt[bank].nextcxtpage += 8;
vfl_gen_checksum(bank);
memset(spareData, 0xFF, NANDGeometry->bytesPerSpare);
spareData->meta.usnDec = pstVFLCxt[bank].usnDec;
spareData->type2 = 0;
spareData->type1 = 0x80;
for(i = 0; i < 8; ++i)
{
u32 index = pstVFLCxt[bank].activecxtblock;
u32 block = pstVFLCxt[bank].VFLCxtBlock[index];
u32 page = block * NANDGeometry->pagesPerBlock;
page += pstVFLCxt[bank].nextcxtpage - 8 + i;
nand_write(bank, page, (u8*) &pstVFLCxt[bank], (u8*) spareData, true);
}
good = 0;
for(i = 0; i < 8; ++i)
{
u32 index = pstVFLCxt[bank].activecxtblock;
u32 block = pstVFLCxt[bank].VFLCxtBlock[index];
u32 page = block * NANDGeometry->pagesPerBlock;
page += pstVFLCxt[bank].nextcxtpage - 8 + i;
if(nand_read(bank, page, PageBuffer, (u8*) spareData, true, true) != 0)
continue;
if(memcmp(PageBuffer, &pstVFLCxt[bank], sizeof(VFLCxt)) != 0)
continue;
if(spareData->type2 == 0 && spareData->type1 == 0x80)
++good;
}
return (good > 3) ? 0 : -1;
}
static error_t vsvfl_store_vfl_cxt(vfl_vsvfl_device_t *_vfl, uint32_t _ce) {
if(_ce >= _vfl->geometry.num_ce)
system_panic("vfl: Can't store VFLCxt on non-existent CE\r\n");
vfl_vsvfl_context_t *curVFLCxt = &_vfl->contexts[_ce];
if(curVFLCxt->usn_page + 8 > _vfl->geometry.pages_per_block || FAILED(vsvfl_write_vfl_cxt_to_flash(_vfl, _ce))) {
int startBlock = curVFLCxt->usn_block;
int nextBlock = (curVFLCxt->usn_block + 1) % 4;
while(startBlock != nextBlock) {
if(curVFLCxt->vfl_context_block[nextBlock] != 0xFFFF) {
int fail = 0;
int i;
for (i = 0; i < 4; i++) {
uint32_t bankStart = (curVFLCxt->vfl_context_block[nextBlock] / _vfl->geometry.blocks_per_bank) * _vfl->geometry.bank_address_space;
uint32_t blockOffset = curVFLCxt->vfl_context_block[nextBlock] % _vfl->geometry.blocks_per_bank;
int status = nand_device_erase_single_block(_vfl->device, _ce, bankStart + blockOffset);
if(SUCCEEDED(status))
break;
//vsvfl_mark_bad_vfl_block(_vfl, _ce, curVFLCxt->vfl_context_block[nextBlock], status);
if(i == 3)
fail = 1;
}
if(!fail) {
if(!vfl_check_checksum(_vfl, _ce))
system_panic("vsvfl_store_vfl_cxt: failed checksum\r\n");
curVFLCxt->usn_block = nextBlock;
curVFLCxt->usn_page = 0;
vfl_gen_checksum(_vfl, _ce);
int result = vsvfl_write_vfl_cxt_to_flash(_vfl, _ce);
if(SUCCEEDED(result))
return result;
}
}
nextBlock = (nextBlock + 1) % 4;
}
return EIO;
}
return SUCCESS;
}
static error_t vfl_vsvfl_write_context(vfl_device_t *_vfl, uint16_t *_control_block)
{
vfl_vsvfl_device_t *vfl = CONTAINER_OF(vfl_vsvfl_device_t, vfl, _vfl);
uint32_t ce = vfl->current_version % vfl->geometry.num_ce;
uint32_t i;
// check and update cxt of each CE
for(i = 0; i < vfl->geometry.num_ce; i++) {
if(vfl_check_checksum(vfl, i) == FALSE)
system_panic("vsvfl: VFLCxt has bad checksum.\r\n");
memmove(vfl->contexts[i].control_block, _control_block, 6);
vfl_gen_checksum(vfl, i);
}
// write cxt on the ce with the oldest cxt
if(FAILED(vsvfl_store_vfl_cxt(vfl, ce))) {
bufferPrintf("vsvfl: context write fail!\r\n");
return EIO;
}
return 0;
}
static bool vfl_schedule_block_for_remap(int bank, u16 block)
{
if(vfl_check_remap_scheduled(bank, block))
return true;
LOG("ftl: attempting to schedule bank %d, block %d for remap!\n", bank, block);
// don't do anything for right now to avoid consequences for false positives
return false;
if(pstVFLCxt[bank].remappingScheduledStart == (pstVFLCxt[bank].numReservedBlocks + 10))
{
// oh crap, we only have 10 free spares left. back out now.
return false;
}
// stick this into the list
--pstVFLCxt[bank].remappingScheduledStart;
pstVFLCxt[bank].reservedBlockPoolMap[pstVFLCxt[bank].remappingScheduledStart] = block;
vfl_gen_checksum(bank);
return vfl_commit_cxt(bank);
}
int VFL_Open(void)
{
void* FTLCtrlBlock;
u16 buffer[3];
int bank = 0;
for(bank = 0; bank < NANDGeometry->banksTotal; bank++) {
VFLCxt* curVFLCxt;
int i;
int minUsn;
int VFLCxtIdx;
int last;
int page;
if(!findDeviceInfoBBT(bank, pstBBTArea)) {
LOG("ftl: findDeviceInfoBBT failed\n");
return -1;
}
if(bank >= NANDGeometry->banksTotal) {
return -1;
}
curVFLCxt = &pstVFLCxt[bank];
// Any VFLCxt page will contain an up-to-date list of all blocks used to store VFLCxt pages. Find any such
// page in the system area.
for(i = 1; i < FTLData->sysSuBlks; i++) {
// so pstBBTArea is a bit array of some sort
if(!(pstBBTArea[i / 8] & (1 << (i & 0x7))))
continue;
if(nand_read_vfl_cxt_page(bank, i, 0, PageBuffer, SpareBuffer) == true) {
memcpy(curVFLCxt->VFLCxtBlock, ((VFLCxt*)PageBuffer)->VFLCxtBlock, sizeof(curVFLCxt->VFLCxtBlock));
break;
}
}
if(i == FTLData->sysSuBlks) {
LOG("ftl: cannot find readable VFLCxtBlock\n");
return -1;
}
// Since VFLCxtBlock is a ringbuffer, if blockA.page0.spare.usnDec < blockB.page0.usnDec, then for any page a
// in blockA and any page b in blockB, a.spare.usNDec < b.spare.usnDec. Therefore, to begin finding the
// page/VFLCxt with the lowest usnDec, we should just look at the first page of each block in the ring.
minUsn = 0xFFFFFFFF;
VFLCxtIdx = 4;
for(i = 0; i < 4; i++) {
SpareData* spareData;
u16 block = curVFLCxt->VFLCxtBlock[i];
if(block == 0xFFFF)
continue;
if(nand_read_vfl_cxt_page(bank, block, 0, PageBuffer, SpareBuffer) != true)
continue;
spareData = (SpareData*) SpareBuffer;
if(spareData->meta.usnDec > 0 && spareData->meta.usnDec <= minUsn) {
minUsn = spareData->meta.usnDec;
VFLCxtIdx = i;
}
}
if(VFLCxtIdx == 4) {
LOG("ftl: cannot find readable VFLCxtBlock index in spares\n");
return -1;
}
// VFLCxts are stored in the block such that they are duplicated 8 times. Therefore, we only need to
// read every 8th page, and nand_read_vfl_cxt_page will try the 7 subsequent pages if the first was
// no good. The last non-blank page will have the lowest spare.usnDec and highest usnInc for VFLCxt
// in all the land (and is the newest).
last = 0;
for(page = 8; page < NANDGeometry->pagesPerBlock; page += 8) {
if(nand_read_vfl_cxt_page(bank, curVFLCxt->VFLCxtBlock[VFLCxtIdx], page, PageBuffer, SpareBuffer) == false) {
break;
}
last = page;
}
if(nand_read_vfl_cxt_page(bank, curVFLCxt->VFLCxtBlock[VFLCxtIdx], last, PageBuffer, SpareBuffer) == false) {
LOG("ftl: cannot find readable VFLCxt\n");
return -1;
}
// Aha, so the upshot is that this finds the VFLCxt and copies it into pstVFLCxt
memcpy(&pstVFLCxt[bank], PageBuffer, sizeof(VFLCxt));
// This is the newest VFLCxt across all banks
if(curVFLCxt->usnInc >= curVFLusnInc) {
curVFLusnInc = curVFLCxt->usnInc;
}
// Verify the checksum
if(vfl_check_checksum(bank) == false) {
LOG("ftl: VFLCxt has bad checksum\n");
return -1;
}
}
// retrieve the FTL control blocks from the latest VFL across all banks.
FTLCtrlBlock = VFL_GetFTLCtrlBlock();
// Need a buffer because eventually we'll copy over the source
memcpy(buffer, FTLCtrlBlock, sizeof(buffer));
// Then we update the VFLCxts on every bank with that information.
for(bank = 0; bank < NANDGeometry->banksTotal; bank++) {
memcpy(pstVFLCxt[bank].FTLCtrlBlock, buffer, sizeof(buffer));
vfl_gen_checksum(bank);
}
return 0;
}
static int VFL_Open() {
int bank = 0;
for(bank = 0; bank < Data->banksTotal; bank++) {
if(!findDeviceInfoBBT(bank, pstBBTArea)) {
bufferPrintf("ftl: findDeviceInfoBBT failed\r\n");
return -1;
}
if(bank >= Data->banksTotal) {
return -1;
}
VFLCxt* curVFLCxt = &pstVFLCxt[bank];
uint8_t* pageBuffer = malloc(Data->bytesPerPage);
uint8_t* spareBuffer = malloc(Data->bytesPerSpare);
if(pageBuffer == NULL || spareBuffer == NULL) {
bufferPrintf("ftl: cannot allocate page and spare buffer\r\n");
return -1;
}
int i = 1;
for(i = 1; i < Data2->field_0; i++) {
// so pstBBTArea is a bit array of some sort
if(!(pstBBTArea[i / 8] & (1 << (i & 0x7))))
continue;
if(vfl_read_page(bank, i, 0, pageBuffer, spareBuffer) == TRUE) {
memcpy(curVFLCxt->VFLCxtBlock, ((VFLCxt*)pageBuffer)->VFLCxtBlock, sizeof(curVFLCxt->VFLCxtBlock));
break;
}
}
if(i == Data2->field_0) {
bufferPrintf("ftl: cannot find readable VFLCxtBlock\r\n");
free(pageBuffer);
free(spareBuffer);
return -1;
}
int minLpn = 0xFFFFFFFF;
int VFLCxtIdx = 4;
for(i = 0; i < 4; i++) {
uint16_t block = curVFLCxt->VFLCxtBlock[i];
if(block == 0xFFFF)
continue;
if(vfl_read_page(bank, block, 0, pageBuffer, spareBuffer) != TRUE)
continue;
SpareData* spareData = (SpareData*) spareBuffer;
if(spareData->logicalPageNumber > 0 && spareData->logicalPageNumber <= minLpn) {
minLpn = spareData->logicalPageNumber;
VFLCxtIdx = i;
}
}
if(VFLCxtIdx == 4) {
bufferPrintf("ftl: cannot find readable VFLCxtBlock index in spares\r\n");
free(pageBuffer);
free(spareBuffer);
return -1;
}
int page = 8;
int last = 0;
for(page = 8; page < Data->pagesPerBlock; page += 8) {
if(vfl_read_page(bank, curVFLCxt->VFLCxtBlock[VFLCxtIdx], page, pageBuffer, spareBuffer) == FALSE) {
break;
}
last = page;
}
if(vfl_read_page(bank, curVFLCxt->VFLCxtBlock[VFLCxtIdx], last, pageBuffer, spareBuffer) == FALSE) {
bufferPrintf("ftl: cannot find readable VFLCxt\n");
free(pageBuffer);
free(spareBuffer);
return -1;
}
// Aha, so the upshot is that this finds the VFLCxt and copies it into pstVFLCxt
memcpy(&pstVFLCxt[bank], pageBuffer, sizeof(VFLCxt));
if(curVFLCxt->field_0 >= VFLData4) {
VFLData4 = curVFLCxt->field_0;
}
free(pageBuffer);
free(spareBuffer);
if(vfl_check_checksum(bank) == FALSE) {
bufferPrintf("ftl: VFLCxt has bad checksum\n");
return -1;
}
}
void* maxThing = VFL_get_maxThing();
uint16_t buffer[3];
memcpy(buffer, maxThing, 6);
for(bank = 0; bank < Data->banksTotal; bank++) {
memcpy(pstVFLCxt[bank].field_4, buffer, sizeof(buffer));
vfl_gen_checksum(bank);
}
return 0;
}
static error_t vfl_vsvfl_open(vfl_device_t *_vfl, nand_device_t *_nand)
{
vfl_vsvfl_device_t *vfl = CONTAINER_OF(vfl_vsvfl_device_t, vfl, _vfl);
if(vfl->device || !_nand)
return EINVAL;
vfl->device = _nand;
error_t ret = vfl_vsvfl_setup_geometry(vfl);
if(FAILED(ret))
return ret;
bufferPrintf("vsvfl: Opening %p.\r\n", _nand);
vfl->contexts = malloc(vfl->geometry.num_ce * sizeof(vfl_vsvfl_context_t));
memset(vfl->contexts, 0, vfl->geometry.num_ce * sizeof(vfl_vsvfl_context_t));
vfl->pageBuffer = (uint32_t*) malloc(vfl->geometry.pages_per_block * sizeof(uint32_t));
vfl->chipBuffer = (uint16_t*) malloc(vfl->geometry.pages_per_block * sizeof(uint16_t));
vfl->blockBuffer = (uint16_t*) malloc(vfl->geometry.banks_total * sizeof(uint16_t));
uint32_t ce = 0;
for(ce = 0; ce < vfl->geometry.num_ce; ce++) {
vfl->bbt[ce] = (uint8_t*) malloc(CEIL_DIVIDE(vfl->geometry.blocks_per_ce, 8));
bufferPrintf("vsvfl: Checking CE %d.\r\n", ce);
if(FAILED(nand_device_read_special_page(_nand, ce, "DEVICEINFOBBT\0\0\0",
vfl->bbt[ce], CEIL_DIVIDE(vfl->geometry.blocks_per_ce, 8))))
{
bufferPrintf("vsvfl: Failed to find DEVICEINFOBBT!\r\n");
return EIO;
}
if(ce >= vfl->geometry.num_ce)
return EIO;
vfl_vsvfl_context_t *curVFLCxt = &vfl->contexts[ce];
uint8_t* pageBuffer = malloc(vfl->geometry.bytes_per_page);
uint8_t* spareBuffer = malloc(vfl->geometry.bytes_per_spare);
if(pageBuffer == NULL || spareBuffer == NULL) {
bufferPrintf("ftl: cannot allocate page and spare buffer\r\n");
return ENOMEM;
}
// Any VFLCxt page will contain an up-to-date list of all blocks used to store VFLCxt pages. Find any such
// page in the system area.
int i;
for(i = vfl->geometry.reserved_blocks; i < vfl->geometry.fs_start_block; i++) {
// so pstBBTArea is a bit array of some sort
if(!(vfl->bbt[ce][i / 8] & (1 << (i & 0x7))))
continue;
if(SUCCEEDED(nand_device_read_single_page(vfl->device, ce, i, 0, pageBuffer, spareBuffer, 0)))
{
memcpy(curVFLCxt->vfl_context_block, ((vfl_vsvfl_context_t*)pageBuffer)->vfl_context_block,
sizeof(curVFLCxt->vfl_context_block));
break;
}
}
if(i == vfl->geometry.fs_start_block) {
bufferPrintf("vsvfl: cannot find readable VFLCxtBlock\r\n");
free(pageBuffer);
free(spareBuffer);
return EIO;
}
// Since VFLCxtBlock is a ringbuffer, if blockA.page0.spare.usnDec < blockB.page0.usnDec, then for any page a
// in blockA and any page b in blockB, a.spare.usNDec < b.spare.usnDec. Therefore, to begin finding the
// page/VFLCxt with the lowest usnDec, we should just look at the first page of each block in the ring.
int minUsn = 0xFFFFFFFF;
int VFLCxtIdx = 4;
for(i = 0; i < 4; i++) {
uint16_t block = curVFLCxt->vfl_context_block[i];
if(block == 0xFFFF)
continue;
if(FAILED(nand_device_read_single_page(vfl->device, ce, block, 0, pageBuffer, spareBuffer, 0)))
continue;
vfl_vsvfl_spare_data_t *spareData = (vfl_vsvfl_spare_data_t*)spareBuffer;
if(spareData->meta.usnDec > 0 && spareData->meta.usnDec <= minUsn) {
minUsn = spareData->meta.usnDec;
VFLCxtIdx = i;
}
}
if(VFLCxtIdx == 4) {
bufferPrintf("vsvfl: cannot find readable VFLCxtBlock index in spares\r\n");
free(pageBuffer);
free(spareBuffer);
return EIO;
}
// VFLCxts are stored in the block such that they are duplicated 8 times. Therefore, we only need to
// read every 8th page, and nand_readvfl_cxt_page will try the 7 subsequent pages if the first was
// no good. The last non-blank page will have the lowest spare.usnDec and highest usnInc for VFLCxt
// in all the land (and is the newest).
int page = 8;
int last = 0;
for(page = 8; page < vfl->geometry.pages_per_block; page += 8) {
if(nand_device_read_single_page(vfl->device, ce, curVFLCxt->vfl_context_block[VFLCxtIdx], page, pageBuffer, spareBuffer, 0) != 0) {
break;
}
last = page;
}
if(nand_device_read_single_page(vfl->device, ce, curVFLCxt->vfl_context_block[VFLCxtIdx], last, pageBuffer, spareBuffer, 0) != 0) {
bufferPrintf("vsvfl: cannot find readable VFLCxt\n");
free(pageBuffer);
free(spareBuffer);
return -1;
}
// Aha, so the upshot is that this finds the VFLCxt and copies it into vfl->contexts
memcpy(&vfl->contexts[ce], pageBuffer, sizeof(vfl_vsvfl_context_t));
// This is the newest VFLCxt across all CEs
if(curVFLCxt->usn_inc >= vfl->current_version) {
vfl->current_version = curVFLCxt->usn_inc;
}
free(pageBuffer);
free(spareBuffer);
// Verify the checksum
if(vfl_check_checksum(vfl, ce) == FALSE)
{
bufferPrintf("vsvfl: VFLCxt has bad checksum.\r\n");
return EIO;
}
}
// retrieve some global parameters from the latest VFL across all CEs.
vfl_vsvfl_context_t *latestCxt = get_most_updated_context(vfl);
// Then we update the VFLCxts on every ce with that information.
for(ce = 0; ce < vfl->geometry.num_ce; ce++) {
// Don't copy over own data.
if(&vfl->contexts[ce] != latestCxt) {
// Copy the data, and generate the new checksum.
memcpy(vfl->contexts[ce].control_block, latestCxt->control_block, sizeof(latestCxt->control_block));
vfl->contexts[ce].usable_blocks_per_bank = latestCxt->usable_blocks_per_bank;
vfl->contexts[ce].reserved_block_pool_start = latestCxt->reserved_block_pool_start;
vfl->contexts[ce].ftl_type = latestCxt->ftl_type;
memcpy(vfl->contexts[ce].field_6CA, latestCxt->field_6CA, sizeof(latestCxt->field_6CA));
vfl_gen_checksum(vfl, ce);
}
}
// Vendor-specific virtual-from/to-physical functions.
// Note: support for some vendors is still missing.
nand_device_t *nand = vfl->device;
uint32_t vendorType = vfl->contexts[0].vendor_type;
if(!vendorType)
if(FAILED(nand_device_get_info(nand, diVendorType, &vendorType, sizeof(vendorType))))
return EIO;
switch(vendorType) {
case 0x10001:
vfl->geometry.banks_per_ce = 1;
vfl->virtual_to_physical = virtual_to_physical_10001;
break;
case 0x100010:
case 0x100014:
case 0x120014:
vfl->geometry.banks_per_ce = 2;
vfl->virtual_to_physical = virtual_to_physical_100014;
break;
case 0x150011:
vfl->geometry.banks_per_ce = 2;
vfl->virtual_to_physical = virtual_to_physical_150011;
break;
default:
bufferPrintf("vsvfl: unsupported vendor 0x%06x\r\n", vendorType);
return EIO;
}
if(FAILED(nand_device_set_info(nand, diVendorType, &vendorType, sizeof(vendorType))))
return EIO;
vfl->geometry.pages_per_sublk = vfl->geometry.pages_per_block * vfl->geometry.banks_per_ce * vfl->geometry.num_ce;
vfl->geometry.banks_total = vfl->geometry.num_ce * vfl->geometry.banks_per_ce;
vfl->geometry.blocks_per_bank_vfl = vfl->geometry.blocks_per_ce / vfl->geometry.banks_per_ce;
uint32_t banksPerCE = vfl->geometry.banks_per_ce;
if(FAILED(nand_device_set_info(nand, diBanksPerCE_VFL, &banksPerCE, sizeof(banksPerCE))))
return EIO;
bufferPrintf("vsvfl: detected chip vendor 0x%06x\r\n", vendorType);
// Now, discard the old scfg bad-block table, and set it using the VFL context's reserved block pool map.
uint32_t bank, i;
uint32_t num_reserved = vfl->contexts[0].reserved_block_pool_start;
uint32_t num_non_reserved = vfl->geometry.blocks_per_bank_vfl - num_reserved;
for(ce = 0; ce < vfl->geometry.num_ce; ce++) {
memset(vfl->bbt[ce], 0xFF, CEIL_DIVIDE(vfl->geometry.blocks_per_ce, 8));
for(bank = 0; bank < banksPerCE; bank++) {
for(i = 0; i < num_non_reserved; i++) {
uint16_t mapEntry = vfl->contexts[ce].reserved_block_pool_map[bank * num_non_reserved + i];
uint32_t pBlock;
if(mapEntry == 0xFFF0)
continue;
if(mapEntry < vfl->geometry.blocks_per_ce) {
pBlock = mapEntry;
} else if(mapEntry > 0xFFF0) {
virtual_block_to_physical_block(vfl, ce + bank * vfl->geometry.num_ce, num_reserved + i, &pBlock);
} else {
system_panic("vsvfl: bad map table: CE %d, entry %d, value 0x%08x\r\n",
ce, bank * num_non_reserved + i, mapEntry);
}
vfl->bbt[ce][pBlock / 8] &= ~(1 << (pBlock % 8));
}
}
}
bufferPrintf("vsvfl: VFL successfully opened!\r\n");
return SUCCESS;
}
